Invite your friends to your kids' LEGO Ninjago birthday party with these awesome birthday party invitations! Featuring characters from the movie, go ahead and pick up our thank you cards to match! Check out our complete selection of LEGO Ninjago party supplies too! Paper. Includes 8 invitations and 8 envelopes. 6 1/2" x 4 1/2" © 2017 The LEGO Group. All Rights Reserved.